Harness cord sheave mechanism for looms



July 3, 1945. o. v. PAYNE HARNESS CORD SHEAVE MECHANISM FOR LOOMS Filed-June 3, 1944 2 Sheets-Sheet l hum July 3, 1945. o. y. PAYNE HARNESS CORD SHEAVEMMECHANISM FOR LOOMS Filed June 3, 1944 "2 Sheets-Sheet 2 Patented July 3, 1945 HARNE S S CORD This invention: relates toimprovements in harness mechanisms for looms and it is the general object of the invention to provide an improved i harness cord sheave mechanism which permits the use of longer hubs on the sheaves than have been used heretofore. i i

The harness frames of looms are usually arranged side by side inclose relationship and are raised and lowered by mechanism including jacks or levers which are also close together. Harness cords extend from the jacks over sheaves to the harness frames, and the sheaves are usually as closely related as are the jacks and frames. It has been customary in the past to place all of the sheaves for one end of the group of harness frames on a single shaft with the result that the sheave hubs have been too short to withstand the S'HEAVEMECHANISM FOR OMS. Oscar V. Payne, Leicester, Mass, assignorto ,1 Crompton & Knowles Loom Works, Worcester,

Mass, a corporation of Massachusetts Application June 3, 1944,, Serial No. 538,599 sclai s (o1.139- -55)' wearing incident to their constant oscillation. It i is an important object of my present invention to provide two sets of sheaves, each havingits own supporting shaft and each sheave, having a hub which is approximately twice the width of the sheave, thereby afiording a considerable increase in the wearing surface of the hub;

In arranging the sheaves between the loom parts hereinafter described and set forth.

frames toestablish proper balancewhenthe harness frames are raised andlowered. In order to accomplish this result itis another objectof my 3 invention to staggerthe sheave rims of one set with respect to thesrims of the other set and loi cate the supporting'ishafts in such positions that the sheaves of one, set overlap, or enter the spacesbetween, tnesheaves-of the other set; By 9 this arrangement 'the distance between the sup porting shafts may besubstantially less than the diameter of a sheave and the points of connection between the harness frames and the cords of the two sets maybe close together. M

It is another object of my invention topro vide an improved harness cord sheave the hub' and rim of which are so related as to make possible the attainment of the foregoing advantages. With these and other objects in view which will appear asthe description proceeds, my invention resides in the combination and arrangement of In the accompanying drawings, wherein a con:

venient embodiment of my invention is set forth,

arches it is desirable that as little space be wasted as possible so that the loom'will have capacity for a large number of harness frames. It is another object of my present invention to arrange l the hub and sheave relationship in such a manner that a large part ortheavailablespace be tween the loom arches can be utilized for sheaves.

This result will be accomplished by using a hub the greater part of which lies on one side of the rim of the hub and arranging all ,of the sheaves in one set with the'long parts of their hubs fac- ,ing in one direction such as forwardly, and arranging all the sheaves of the other set with the long parts of their hubs facing in the opposite direction, such as rearwardly. By this arrangement the rims of one set are staggered with re;

spect to the rims of the other set to provide proper clearance for the harness cords, and no space is wasted between the arches. I findthat these results can be convenientlyaccomplished by having that part of the hub of one side of theplane of the rim three times as long as the other part of the hub lying on the opposite side of the planefin Y i When two sets of sheaves are used for one end of the group or pluralityof harness frames is desirable that they be'located as closely together Fig. l. is a front elevation of the upperpart of a loom showing harness mechanism with my invention applied thereto,

Fig. 2 is a diagrammatic plan view looking in the direction of arrow 2, Fig. 1, showing the staggered relationship of the sheave rims andalso showing the relation, between the plane of the sheave rims and, the ends of their hubs, Fig.3 is a view similar to the upper part of Fig. 2 but showing the details of the construction involved,parts being in section, and some parts omitted in thelower part of the figure,

Fig.4 is a verticalsectionon line 4-4 of Fig 3, certain parts of. the sheaves be ng broken away to showthe structure behind them, and i i Fig. 5 is a verticals ction. on line 5--5, Fig. 4, looking toward theleft, l

Referring particularly a loom frame Ill; across the upper part of which extend frontand back arches H and 12, re-

as possible so that the points ofattachment be tween the harness cords andthe harnessframes may be near enough to the ends of the harness spectively. The arches may support a harness. lifting mechanism K including harness jacks or levers l3 and I4, which may be part of a dobby" i or Knowles head or other convenient harness lifting mechanism. The jacks or levers rock-back and forth in a right and left hand directionas viewed in Fig. 1 during loom operationpand it is tojbe understood that there will be a number of these jacks; some or which wn occupy the posij tion of jack l3 andothers the position of jack M in Fig. 1. The order of movement of thesejacks to Fig. 1; I have shown i during successive picks of the loom determine the pattern of the fabric being woven.

The loom is provided with a group or plurality of harness frames two of which are shown in'Fig. 1. The front. harness frame I5 is shown in down position and corresponds to the Jack I 3, while the harness frame I6 is in up position behind frame I5 and corresponds to jack 4. There will ordinarily be asmanyfharness frames as there are jack and'some of the frames will be in low position while others will be in high position when the warp shed is wide open for the flight of the shuttle. H j i The jacks are connected to the harness frames by a system of cords designated generally at C, each jack having a connector for two harness cords which run to the correspondingharness frame. Thus, in Fig. 1 connector I8 attached to jack I3 is connected to cords=l 9 rand zflileading to the front harness frame l5, while the jack I4 is associated with a connector 2| attached by cords. 2 2. and .23 leading to harness frame 16.

In the past. it has sheen customary to train the cords -|9.and 22 around a set of sheaves all oscillating on .a single shaft, and in, similar manner the cords Hand 23 .havefloeen trained around another set of sheaves on asingle shaft. By such an arrangement, however, the space assignable to each sheavealong its shaft will be no longer than the width of a sheave. rim or harness .frame,-and this relationship leads toundue wear of the sheaves when the harness frames are operating with heavy warps. It is an important feature of my invention to ;.provide meansfor reducing this wear of the sheaves.

The matter thus far describedis, of common construction and of itself forms no part of my present invention. l

In carrying my invention into effect I provide two pairs of .sets of sheaves, one pair for each end of the loom, and mount each set on a shaft extending between the arches. Thesepairs of sets, R and L for the right and left end of the loom,

respectively, are alikeand a detaileddescription of one of them such as .pair L' will sufiice for both.

, Rear arch '|.2 ,.s'ee Figs. 3, 4and 5, is provided with a block 25 having a vertical wall 26 which fits between the top and bottom flange fl and 28 of the arch and is'held against the vertical web 29 of the arch by means of a'bolt 30. Extending forwardly 'from'the ends of the Wall '26 are'right and left vertically extending Wings 32 and '33,

The walls 35 and 36 have their rear edges notched at 38 to receive the top and bottom flanges 2-1 and Z8, .respectivelyof arch I2, and each wall has an extension 39 projectingbeyond each .notch. .The extensions at the tops of walls sponding slot 3'! but too large to turn therein, see

the lower right hand part of Fig. 3. For the purpose of illustrating the relation between heads and their slots 31, the wing nuts 43 and bearings 4| have been omitted from the bottom of Fig. 3. Arch is provided with a block 46 similar to and in front of block 25, except that it is reversed, as will be understood from the bottom of Fig. 3.

Extending between blocks 25 and 46 are two parallel horizontal sheaves supporting shafts 50 and 5| the ends of which extend into guide slots 3] and are held in adjusted vertical position by the heads 45 of bolts 42. These shafts support sets 52 andf53 ,of harness cord sheaves, respec tively, and each set comprises a plurality of simiilar sheaves 54 made as shown more particularly in Figs. .2 and 5.

Each sheave has a rim 55 and a hub 56 the greater part .of which is .displ'acedion one side of its rim. This relationship is shown diagram:

matically in Fig. 2 wherein the :heavy horizontal lines 60 represent :the planes mane trims of the sheaves :in set 52 and the longiand short parts 'of l have cord receiving grooves i5! which may be respectively, each having al'ateral web 34 extend- 35 and .36 are provided with upwardly facing concave/pockets 411,.see Figs. 3 and 5, whichare concentric about an axis substantially parallel to the horizontal part of the loom arches. Resting in each pair of pockets is .a cylindrical bearing 4| extending substantially parallel to. the arches. An uprightbolt 42 passes through each bearing 4| and has a wing nut 43 tapped onthe upper end thereof the lower, surface'ofwhich is consemi-circular in cross section, .as seen .in Fig, 5, i and the plane of each rim .may be considered as extending centrally through its groove .51! and perpendicular to-its axis. i

As shown c1ear1yinFign2 the sheaves of Ttheset 52 are all arranged with the dong parts =51 of their hubs extending forwardly-while :the sheaves of the other set 53have the long parts 361 of :their hubs extending rearwardly. Because of the relationship between the short :and lon'gxparts of the hubs the .reversal of the hubsofoneset of :sl'ieavesv represented by the top and (bottom lines land II,

sheave hubs except ifor is fully .occupiedby the. washers 6'1.

In Fig. .2 I have snow-nan run size anaemia. ship'between the hubparts a6-| and '62 relatively .to the plane of the rims as, it would :exist on a so-called 1 s Knowles head in whichthe hub 15.6 is

1" long and the long part thereof is %"..long. LI

am not limited, however, to .this'particularssize,

inasmuch as the invention is rapplicable-ato other gauges of harness mechan-ism so long as :the short part 6|, represented at a, is approxi ately onethird the length of the long part =6| represented;

by 3 in Fig.2.

Another feature of location of the rims :of one setwithrespectlto the to the fact that the rims can be much narrower than the hubs, there are spaces :between :the rims I of each sheave into which the rims of the other sheaves can project. .as shown in Fig. 3, the .left hand parts of the rims of; -set;52-.extend,.

my invention relates to the 1 I correct balance .level than the other set,

intothe spaces aligned with longhubparts 6i and located. between the right ,hand parts'of the rims of setp53, @This overlapping-of the rims makes it possible to locatethe shafts 5,0: and 5| close enough together so thatthecords-N and 22 can b attached to theirrespe'ctive harness frames near the left ends of thelatter to insure of the frames, and nearer together than would be possible if the shafts were spaced by a distance greater thanthe diameter of asheave.

The rim of each set of sheaves. clear the. hubs of the other Fig. 4, there setv may be other is sufficient clearance so that either moved to a position'highcr than the set and also, as will be apparent from set without interference on the part of the.

hubs and rims of the two sets." In this connection it'is' desirable that the set of sheaves nearer the harness mechanismK be at a somewhat lower although this is not a necessary relationship inasmuch as there is sufficient clearance for the cords if they are all kept in the usual position. I

While I have specifically shown and described the details of the group L of sheave sets at the left end of the loom, yet it is to be understood that the group R is of similar construction and is possessed of all the advantages set forth in connectionwith the group L. The winged nuts afford means for raising and lowering the shafts 50 and 5| for the purpose of locating the harness frames properly in the loom and each shaft is guided by two of the slots 31. walls 35 and 36 with th notches 38 I am able to locate the bolts 42 very close to the arches. The tops of the walls 35 and 36 overhang the upper part of the arch flange 27 as will'be apparent in Fig. 5, thereby affording proper bearing surface between the pockets 4!] and the bearings 4|. The bottoms of walls 35 and 3B are also provided with pockets ll) so that the blocks can be inverted.

From the foregoing it will be seen that I have By providing the I direction and 1.; In harness cord sheave*-mechanismw'=for:.a-, loom, a pair of horizontalgparallelpshaftsfa set of sheaves; on each shaft, said sheavesall being similar and each having a cord engagingrim and a hub extending unequal distances on opposite sides of the rim; all the sheaves-on one ofl'said,

shafts having their hubs disposed in: the same all the sheaves on the other shaft having their hubs disposed in the opposite. di-

rection, andsaid hubs being so. related to the runs as to cause the rims of one set ofl sheaves. to be staggered laterally with respect to thesrims of the other set of sheaves. 1 l 2. In harness mechanism for a loom, apair of.

shafts, a set of harness sheaves on eachshaft, the sheaves being similar and eachhaving a rim. and a hub having .a long part onone side ;of- :the. corresponding rim, thelong part of the .hubs:

of one set all being on the same side of theircore;

responding rims and the long part ofthe hubs;

of the other set all being on the opposite side of their corresponding rims, and the rims of each set being aligned with the long parts of the hubs of the other set and staggered laterally with respect to the rims of the other set. 1

In a loom harness mechanism having two parallel shafts each having a set of harness cord sheavesthereon, all of said sheaves being similar and each sheave having a hub of given length and a cord receiving rim the plane of which is perpendicular to the axisof the hub and passes centrally through the rim and cuts said axis at a point spaced from one end of the hub by a distance equal to one quarter of said given length of the hub, the hubs of the sheaves on each of said shafts being to their rims, and the hubs of the sheaves on one shaft being reversed with respect to the hubs of the sheaves on the other shaft so that the rims of one set of sheaves are staggered laterally with respect to the rims of the other set of sheaves.

provided a simple form of harness sheave arrangement wherein the hubs of the sheaves extend unequal distances on opposite sides of the planes of the rims. This relationship permits a reversal of the hubs of oneset with respect to The advantages of this feature of my invention'are best obtained when the short part of the two sets, thereby permitting attachment of the cords to their respective harness frames at points closer together than would be possible without the overlapping of the rims. The harness frames are therefore substantially in balance whether they be connected to cor trained over one or the other of the sets of sheaves. It will also be seen that the walls 35 and 36 extend above and below the flanges of the arches and are provided with overhanging parts in which the pockets 40 are located. The bottoms of the walls are formed similarly to their upper ends and it is for this reason that the blocks 25 and 46 can be inverted. g I

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

laterally relatively to the than the diameter of 4. In a loom harness mechanism having two parallel shafts extending between front and back arches, a set of harness cord sheaves on each shaft, said sheaves all being similar and each sheave having a hub anda cord receiving rim the plane of which passing centrally through the rim and perpendicular to the axis of the hub passes between two parts of the hub one of which is three times as long as the other part, each sheave on one of said shafts having the long part of the hub thereof facing the front arch and each sheave on the other shaft having the long part of the hub thereof facing the rear arch, and the rims of one set of sheaves aligning with the long part of the hubs of the other set, whereby the rims of one set of sheaves are staggered rims of the other. set of sheaves.

5. In harness mechanism for a loom having a pair of arches and a plurality of harness frames,

two sets ofsimilar harness sheaves turning about two parallel axes spaced apart a distance less a sheave, and hubs on the sheaves of each set spacing the sheaves laterally in such relation that the sheaves of each set enter spaces between the sheaves of the other set.

6. In harness mechanism for a loom, two sets of similar harness sheaves turning about two parallel axes spaced apart a distance less than the diameter of a sheave, and hubs on the sheaves of each set spacing the sheaves laterally and staggering the sheaves of each set laterally with respect to the sheaves of the other set so that the similarly placed with respect.

, sheaves (of each set overlap #and extend between the sheaves of *the 'other set. 1

lIn harness 'mechanismfor a, loom having a pair of :arches and a plurality of harness frames,

a pair o'f shafts extending-.betweenthe arches, a

.se'tof :hasrness sheaves on each shaft, the sheaves being similar and ea'eh having -a rim and a hub, the hubs of each-set separating the of the a e'zeme conresponding'set by spaces, and the rims of each a set-extending into the spaces between the rims of the' other set.

8. 111 harness :m'echani'sm -for a loom having a pairof arches and a plurality of harness fr ames portingsaid shafts a-distanae *apart less than the diameter of a sheave, whereby the rims of one set :of sheaves overlap the rims of the other v set of sheaves', each set having rimsqocated between rims of .the other set.

9. harness mechanism of :sha'fts, a setof harness sheaves oneach shaft,

the sheaves 'being similanand each having a rim and a-hub having a "long -part on one side -of the corresponding 'rim,"the1ong*pa-rt of the hubs of one set all being on the. same side of their corresponding rims and the *longpart of the hubs of the other set aZll being on the Opposite side of --their corresponding rims, the hubs of "each set separating their "rims by "spaces, and means supporting said shafts so that the rims of each set enter thespaces between the rims of the other set. v OSCAR v. PAYNE.

for a 'loom, a pair 

